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Occurrence of the Upper Cretaceous ammonite Rhaeboceras in the Baculites eliasi Zone of the Pierre Shale

Published online by Cambridge University Press:  14 July 2015

Joyce C. Grier ,
James W. Grier  and
Jack G. Petersen
Joyce C. Grier
Affiliation:
Geology Department, North Dakota State University, Fargo 58105-5517, Zoology
James W. Grier
Affiliation:
Department, North Dakota State University, Fargo 58105-5517
Jack G. Petersen
Affiliation:
1256 Hammond, Waterloo, Iowa 50702
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Extract

The discovery of a specimen of Rhaeboceras coloradoense Cobban, 1987, in the Baculites eliasi zone in east-central Montana is significant for three reasons: 1) it is the most geologically recent occurrence of Rhaeboceras; 2) it connects more closely than previous specimens the lineage between the genus Rhaeboceras Meek and Ponteixites Warren, its apparent smaller descendant; and 3) it significantly extends the geographical range of the species.

Type
Paleontological Notes
Information
Journal of Paleontology , Volume 66 , Issue 3 , May 1992 , pp. 521 - 523
Copyright
Copyright © The Paleontological Society 

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References

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